Datasheet

MAX5068
High-Frequency, Current-Mode PWM Controller
with Accurate Programmable Oscillator
_______________________________________________________________________________________ 5
BOOTSTRAP UVLO WAKE-UP LEVEL
vs. TEMPERATURE
MAX5068 toc01
TEMPERATURE (°C)
V
IN
(V)
85603510-15
21.1
21.2
21.3
21.4
21.5
21.6
21.0
-40 110
MAX5068A/C/D
BOOTSTRAP UVLO SHUTDOWN LEVEL
vs. TEMPERATURE
MAX5068 toc02
TEMPERATURE (°C)
V
IN
(V)
85603510-15
9.6
9.7
9.8
9.9
10.0
9.5
-40 110
V
IN
FALLING
MAX5068A/C/D
UVLO/EN WAKE-UP THRESHOLD
vs. TEMPERATURE
MAX5068 toc03
TEMPERATURE (°C)
UVLO/EN (V)
85603510-15
1.225
1.230
1.235
1.240
1.245
1.220
-40 110
UVLO/EN RISING
UVLO/EN SHUTDOWN THRESHOLD
vs. TEMPERATURE
MAX5068 toc04
TEMPERATURE (°C)
UVLO/EN (V)
85603510-15
1.12
1.11
1.14
1.13
1.16
1.15
1.18
1.17
1.19
1.20
1.10
-40 110
UVLO/EN FALLING
V
IN
SUPPLY CURRENT IN
UNDERVOLTAGE LOCKOUT vs. TEMPERATURE
MAX5068 toc05
TEMPERATURE (°C)
I
START
(µA)
85603510-15
44
48
52
56
60
40
-40 110
V
IN
= 19V
WHEN IN BOOTSTRAP UVLO (MAX5068A/C/D)
UVLO/EN (MAX5068B/E/F) IS LOW
V
IN
SUPPLY CURRENT AFTER STARTUP
vs. TEMPERATURE
MAX5068 toc06
TEMPERATURE (°C)
I
IN
(mA)
85603510-15
2
3
4
5
6
1
-40 110
V
IN
= 24V
f
SW
= 1.25MHz
f
SW
= 500kHz
f
SW
= 250kHz
f
SW
= 100kHz
f
SW
= 50kHz
V
CC
vs. TEMPERATURE
MAX5068 toc07
TEMPERATURE (°C)
V
CC
(V)
85603510-15
7.6
7.3
8.2
7.9
8.8
8.5
9.4
9.1
9.7
10.0
7.0
-40 110
V
IN
= 19V, I
IN
= 25mA
V
IN
= 19V, I
IN
= 10mA
V
IN
= 10.8V, I
IN
= 10mA
V
IN
= 10.8V, I
IN
= 25mA
REG5 OUTPUT VOLTAGE
vs. OUTPUT CURRENT
MAX5068 toc08
OUTPUT CURRENT (mA)
REG5 (V)
1.81.61.41.21.00.80.60.40.2
4.955
4.960
4.965
4.970
4.975
4.980
4.950
0 2.0
R
RT
= 100kΩ
REG5 vs. TEMPERATURE
MAX5068 toc09
TEMPERATURE (°C)
REG5 (V)
85603510-15
4.92
4.91
4.94
4.93
4.96
4.95
4.98
4.97
4.99
5.00
4.90
-40 110
V
IN
= 10.8V
100µA LOAD
1mA LOAD
Typical Operating Characteristics
(V
IN
= +12V for the MAX5068B/E/F; V
IN
= +23.6V for MAX5068A/C/D at startup, then reduces to +12V; C
IN
= C
REG5
= 0.1µF;
C
VCC
= 1µF; R
RT
= 100kΩ; NDRV = floating; V
FB
= 0; V
COMP
= floating; V
CS
= 0; T
A
= +25°C, unless otherwise noted.)